fix: escaped regex chars in pattern

[kittaakos]

Motivation

If regex patterns are not correctly escaped, they will break. Such as the File > Sketchbook issue when there is a sketch with the following invalid name: bar++.

Change description

• Reuse the regex pattern escape mechanism from VS Code.
• Remove strict is-valid-path check. Otherwise, on Windows, it's impossible to open a sketch in the following way: "Arduino IDE.exe" "..\\..\\Documents\\Arduino\\bar++" input will give a false negative result.

Other information

Closes #1600

Reviewer checklist

• PR addresses a single concern.
• The PR has no duplicates (please search among the Pull Requests before creating one)
• PR title and description are properly filled.
• Docs have been added / updated (for bug fixes / features)

[per1234]

I verified this fixes #1600

Thanks Akos!

[AlbyIanna]

Code looks good.

I tested the latest changes (from ~20 mis ago) locally and it works perfectly for me.